Eira is a Welsh name meaning "snow" — and is often given to daughters born in winter. The same word in Welsh is used for the snowfall itself.
Eira has been a popular Welsh girls' name throughout the 20th and 21st centuries. The name is rising slowly in the English-speaking world as Welsh names enter wider use. Two soft syllables and a winter landscape.
Eira does not currently appear in the US Social Security Administration's top 1,000 girls' names, so we don't publish a US rank or birth count for it. That says nothing about the name's standing elsewhere in the world — only that it sits outside the ranked US data we rely on.
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In Pythagorean numerology the letters of Eira reduce to 6, The Nurturer. This is a traditional interpretive system, not a factual claim about the name.